Bug 7122142

Bug Description:

This is a deadlock bug.
One thread calls isAnnotationPresent on an annotated class where the annotation is not yet initialized for its defining classloader. This will result in a call on AnnotationType.getInstance, locking the class object for sun.reflect.annotation.AnnotationType.getInstance will result in a Class.initAnnotationsIfNecessary for that annotation, trying to acquire a lock on the class object of that annotation.
In the meanwhile, another thread has requested Class.getAnnotations for that annotation(!). Since getAnnotations locks the class object it was requested on, the first thread can't lock it when it runs into Class.initAnnotationsIfNecessary for that annotation. But the thread holding the lock will try to acquire the lock for the class object of sun.reflect.annotation.AnnotationType in AnnotationType.getInstance which is hold by the first thread, thus resulting in the deadlock.

The following is an example of deadlock thread dump:

"AnnB":
  waiting to lock monitor 0x0000000006bfdeb0 (object 0x00000007d5ea49e0, a java.lang.Class),
  which is held by "AnnA"
"AnnA":
  waiting to lock monitor 0x0000000006bfd778 (object 0x00000007d5dfe660, a java.lang.Class),
  which is held by "AnnB"

Java stack information for the threads listed above:
===================================================
"AnnB":
    at sun.reflect.annotation.AnnotationType.getInstance(AnnotationType.java:81)
    - waiting to lock <0x00000007d5ea49e0> (a java.lang.Class for sun.reflect.annotation.AnnotationType)
    at sun.reflect.annotation.AnnotationParser.parseAnnotation(AnnotationParser.java:221)
    at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:88)
    at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:70)
    at java.lang.Class.initAnnotationsIfNecessary(Class.java:3089)
    - locked <0x00000007d5dfe660> (a java.lang.Class for Test7122142$AnnB)
    at java.lang.Class.getDeclaredAnnotations(Class.java:3077)
    at Test7122142$Task.run(Test7122142.java:75)
"AnnA":
    at java.lang.Class.initAnnotationsIfNecessary(Class.java:3086)
    - waiting to lock <0x00000007d5dfe660> (a java.lang.Class for Test7122142$AnnB)
    at java.lang.Class.getAnnotation(Class.java:3048)
    at sun.reflect.annotation.AnnotationType.(AnnotationType.java:131)
    at sun.reflect.annotation.AnnotationType.getInstance(AnnotationType.java:84)
    - locked <0x00000007d5ea49e0> (a java.lang.Class for sun.reflect.annotation.AnnotationType)
    at sun.reflect.annotation.AnnotationParser.parseAnnotation(AnnotationParser.java:221)
    at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:88)
    at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:70)
    at java.lang.Class.initAnnotationsIfNecessary(Class.java:3089)
    - locked <0x00000007d5dfd318> (a java.lang.Class for Test7122142$AnnA)
    at java.lang.Class.getDeclaredAnnotations(Class.java:3077)
    at Test7122142$Task.run(Test7122142.java:75)
	

How To Reproduce:

This bug is reproduced under JDK 1.7.0.
It started at JDK 1.7.0, and has been fixed since JDK 1.8.0.
Execute the following scripts to run the test to reproduce the bug (assume the location of the jdk7 test project is jdk7_test_home).

Linux:
${jdk7_test_home}/scripts/7122142.sh [--monitoroff] [--javaloc path]
Windows:
%jdk7_test_home%\scripts\7122142.bat [--monitoroff] [--javaloc path]

Example:
Use monitor to report and terminate the program when deadlock happens:
${jdk_test_home}/scripts/7122142.sh

Turn off monitor:
${jdk_test_home}/scripts/7122142.sh --monitoroff